gibberish vs impenetrable

gibberish

adj
  • unintelligible, incoherent or meaningless 

noun
  • Needlessly obscure or overly technical language. 

  • Speech or writing that is unintelligible, incoherent or meaningless. 

  • A language game, comparable to pig Latin, in which one inserts a nonsense syllable before the first vowel in each syllable of a word. 

impenetrable

adj
  • Incomprehensible; fathomless; inscrutable. 

  • Opaque; obscure; not translucent or transparent. 

  • Not penetrable. 

noun
  • A person not openly given to friendship. 

How often have the words gibberish and impenetrable occurred in a corpus of books? (source: Google Ngram Viewer )